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Diffusion of OH− during hydration of YBa2Cu3O7-y by exposing to water vapor

Published online by Cambridge University Press:  31 January 2011

Yasuro Ikuma ,
Masahiro Yoshimura  and
Shigeru Kabe
Yasuro Ikuma
Affiliation:
Kanagawa Institute of Technology, 1030 Shimoogino, Atsugi, Kanagawa 243-02, Japan
Masahiro Yoshimura
Affiliation:
Research Laboratory of Engineering Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 227, Japan
Shigeru Kabe
Affiliation:
Kanagawa Institute of Technology, 1030 Shimoogino, Atsugi, Kanagawa 243-02, Japan
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Abstract

The hydration of YBa2Cu3O7-y in water vapor was investigated at various values of y and at two different PH2O by measuring the weight of the specimen. The reaction was relatively insensitive to the values of y and was extensive in the water vapor pressure of 2.7 kPa at room temperature and 140 °C. This was due to the decomposition of YBa2Cu3O7-y by reacting with H2O. The weight gain was also detected in the water vapor pressure of 270 Pa. The weight gain under lower water vapor pressure was supposed to be controlled by diffusion of OH− in YBa2Cu3O7-y. The diffusion coefficient calculated from the measurement was compared favorably with the oxygen diffusion coefficient.

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Articles
Information
Journal of Materials Research , Volume 5 , Issue 1 , January 1990 , pp. 17 - 21
Copyright
Copyright © Materials Research Society 1990

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References

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